Can you change the laptop keyboard to a backlit 1?

I only just got a new laptop from HP, Pavilion DV9933cl, Im pretty happy with it except that my powerbook had a backlit keyboard and my HP doesn't. I splurge my notebook alot at night, so a backlit keyboard would help. Is it thinkable to change it, and any idea how untold it would cost and know anyone in Southmost California who can perform it for me? Thanks